ADDITIONAL SYSTEM INFORMATION :
Microsoft Windows 10 Professional
10.0.19044 Build 19044
AMD Ryzen 5 5600G with Radeon Graphics 3.90 GHz
Memory 32 GB

A DESCRIPTION OF THE PROBLEM :
For the simple test case in the attachment, we get different results when we execute using JDK8 than when we execute using JDK11


---------- BEGIN SOURCE ----------
public class testCase8 {
    public static int my_check_sum = 0;
    public testCase8() {}

    public void f() {
        for(int i=0;i<20;i++){
            for(int j=0;j<5000;j++){
                double var3 = Math.pow((double) i, (double) j);
                my_check_sum = Integer.hashCode(my_check_sum+Double.hashCode(var3));
            }
        }
    }

    public static void main(String[] var0) {
        testCase8 var1 = new testCase8();
        var1.f();
        System.out.print("my_check_sum_value:");
        System.out.println(my_check_sum);
    }
}
---------- END SOURCE ----------

FREQUENCY : always